I fully agree. Devs, this problem is now popping up in multiple parts of the game. Sentinels, (cosmic) dragons, vault. Why implement a perfect solution in one part of the game (guardians dropping from chests) but not in other parts of the game? Remove the card from the drop pool in those modes if it is owned 4 times
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640 vault keys no Hierophant!!! (NS) 
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